Loop and concatenate an array in xslt

Question

I am trying to loop an array and concatenate the non null values to a single variable. Needless to say I am new to XSLT. Please see the code that I wrote and let me know the best way to do this.

\ is to be appended at the end and also I have to add a separator * between the values. If * and \ are coming together, then only \ should come and we can omit the *. I believe the logic is correct. The syntax is the issue.

Thanks, Anoop

<xsl:variable name="secondsegmentarray">
    <item>Data/Attribute1</item>
    <item>Data/Attribute2</item>
    <item>Data/Attribute3</item>
    <item>Data/Attribute4</item>
    <item>Data/Attribute5</item>
    <item>Data/Attribute6</item>
    <item>Data/Attribute7</item>
</xsl:variable>
<xsl:variable name="secondsegment">
    <xsl:value-of select="'\'">
    <xsl:for-each select="secondsegmentarray/item">
        <xsl:choose>
         <xsl:when test="$secondsegmentarray.item = '' and secondsegment='\'"/>
         </xsl:when>
         <xsl:when test="$secondsegmentarray.item = not('') and secondsegment='\'"/>
           <xsl:value-of select="concat($secondsegmentarray.item,secondsegment)"/>
         </xsl:when>
         <xsl:when test="$secondsegmentarray.item = not('') and secondsegment!='\'"/>
           <xsl:value-of select="concat($secondsegmentarray.item,'*',secondsegment)"/>
         </xsl:when>
         <xsl:when test="$secondsegmentarray.item = '' and secondsegment!='\'"/>
           <xsl:value-of select="concat('*',secondsegment)"/>
         </xsl:when>
        </xsl:choose>
    </xsl:for-each>
<xsl:variable/>

can you give the expected output for something? And compare with the current output/list any errors you get? — morgan121
– morgan121, Commented Apr 26, 2019 at 12:26
If this is an XSLT 1.0 stylesheet, then your $secondsegmentarray will be of Result Tree Fragment type (the worst decision about the language specification). And then, of course, you cannot iterate over a Result Tree Fragment (from the spec): "An operation is permitted on a result tree fragment only if that operation would be permitted on a string [..]. In particular, it is not permitted to use the /, //, and [] operators on result tree fragments". — Alejandro
– Alejandro, Commented Apr 26, 2019 at 12:50

michael.hor257k · Accepted Answer · 2019-04-28 18:26:14Z

Not really an answer, but too long to fit in a comment. You have numerous syntax issues, starting with:

<xsl:for-each select="secondsegmentarray/item">

which is:

missing a $ character to identify a variable, and:
trying to process a result-tree-fragment without converting it to a node-set first.

The correct syntax would be:

<xsl:for-each select="exsl:node-set($secondsegmentarray)/item">

afer declaring:

xmlns:exsl="http://exslt.org/common"
extension-element-prefixes="exsl"

in the header.

Next, within the xsl:for-each instruction you are in the context of item. This means that any tests related to the current item need to reference the current node, for example:

 <xsl:when test=". = ''">

Your attempted use of $secondsegmentarray.item is meaningless in XPath/XSLT.

In addition, you are referencing the secondsegment variable (again, without the required $ prefix) in the definition of the variable itself. This, of course, cannot work.

There may be more, but these stand out.

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